Performance verification test method for low-low-temperature economizer

Abstract

The invention discloses a performance verification test method for a low-low-temperature economizer, and the method comprises the following specific implementation steps: S1, presetting three test working condition environments X1, X2 and X3 and the position of each parameter to be measured, the parameters to be measured comprising inlet and outlet smoke temperature, inlet and outlet water temperature, smoke pressure and inlet and outlet smoke flow; s2, three low-low-temperature economizer samples are selected and put into test working condition environments X1, X2 and X3 respectively; the invention belongs to the technical field of performance verification of low-low-temperature economizers, and aims at solving the problems that in the prior art, a verification mode combining theoretical calculation and field testing is complex in process and is prone to being restricted by various external factors, and consequently the accuracy of a verification result is poor. The method has the technical effects that the convenience and sufficiency of performance verification are improved by monitoring, analyzing and calculating the operation parameter data of the low-low-temperature economizer under various working conditions in real time.

Description

Technical Field

[0001] The present application relates to the technical field of low-temperature economizer performance verification, and in particular to a performance verification test method for a low-temperature economizer. Background Art

[0002] A low-temperature economizer is a flue gas heat exchanger device, usually installed in the tail flue of a boiler, to recover waste heat from the flue gas for preheating feed water or air. Its working principle is based on the principle of efficient heat exchange. Through its internal structure design, it achieves effective heat transfer between high-temperature fluid and low-temperature medium. The heat of the high-temperature flue gas is transferred to the low-temperature medium, increasing its temperature while significantly reducing the temperature of the flue gas itself. In this way, the low-temperature economizer can cool the flue gas to be treated to below the acid dew point temperature, which not only improves energy utilization efficiency, but also helps reduce the emission of harmful substances in the flue gas, thereby protecting the environment.

[0003] The performance of low-temperature economizers is affected by many factors, such as flue gas temperature, flow rate, water quality and heat exchanger structure. With the widespread use of low-temperature economizers in the industrial and energy fields, it is crucial to conduct a comprehensive and accurate verification of the performance of low-temperature economizers. At present, the performance verification of low-temperature economizers usually adopts a method combining theoretical calculations with field tests. However, this verification method is often complicated and easily restricted by a variety of external factors. Among them, the uncertainty of test conditions, the limitation of test instrument accuracy and the uneven skill level of testers may have an adverse effect on the accuracy of the verification results, resulting in certain limitations and deficiencies in performance verification. Summary of the invention

[0004] To this end, the present application provides a performance verification test method for a low-temperature economizer to solve the problem that the existing verification method combining theoretical calculations with field tests is complicated and easily restricted by various external factors, resulting in poor accuracy of the verification results.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A performance verification test method for a low-temperature economizer, the specific implementation steps are as follows:

[0007] S1: Preset three test working conditions X1, X2, X3 and the positions of various required measurement parameters, where the parameters to be measured include inlet and outlet smoke temperature, inlet and outlet water temperature, smoke pressure and inlet and outlet smoke flow rate;

[0008] S2: Select three low-temperature economizer samples and place them in the test conditions X1, X2, and X3 respectively, and install the sensor module at the preset designated position of the low-temperature economizer in S1;

[0009] S3: The sensor module in S2 is used to collect data of each measurement parameter position under each test condition, and the data collection frequency is once every 5-20 seconds;

[0010] S4: Analyze and calculate the data obtained in S3 respectively, and calculate the heat exchange efficiency P, resistance loss Y and air leakage rate W corresponding to the data collection frequency under the test conditions X1, X2 and X3;

[0011] S5: According to the calculation results in S4, the heat exchange efficiency P-collection frequency t is produced respectively. i , resistance loss Y-collection frequency t i And air leakage rate W-collection frequency t i Graph of the curve.

[0012] Furthermore, the sensor module includes a thermometer, a pressure sensor and a flow meter.

[0013] Furthermore, the thermometers are respectively arranged at the inlet and outlet water sides of the low-temperature economizer and at the flue gas inlet and outlet to monitor the changes of the inlet and outlet water temperature and the inlet and outlet air temperature of the flue gas in real time;

[0014] The pressure sensors are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to monitor the changes of the flue gas inlet and outlet pressures in real time;

[0015] The flow meters are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to monitor the changes of the flue gas flow at the smoke inlet and the smoke gas flow at the smoke outlet in real time.

[0016] Furthermore, the calculation formula of the heat exchange efficiency P is:

[0017]

[0018] Among them, T2 is the water outlet temperature, T1 is the water inlet temperature, E1 is the flue gas inlet temperature, and E2 is the flue gas outlet temperature.

[0019] Furthermore, the calculation formula of the resistance loss Y is:

[0020] Y=A1-A2

[0021] Among them, A1 is the flue gas inlet pressure and A2 is the flue gas outlet pressure.

[0022] Furthermore, the calculation formula of the air leakage rate W is:

[0023]

[0024] Among them, F1 is the flue gas inlet flow rate, and F2 is the flue gas outlet flow rate.

[0025] Furthermore, the temperature ranges in the test working conditions X1, X2, and X3 are 60°C-100°C, 100°C-140°C, and 140°C-180°C, respectively.

[0026] Furthermore, the curve graph can clearly show the performance trend of the low-temperature economizer under different operating conditions, temperatures, pressures and flow rates.

[0027] Compared with the prior art, this application has at least the following beneficial effects:

[0028] By real-time monitoring, analysis and calculation of the operating parameter data of the low-temperature economizer under various operating conditions, the key performance indicators of the heat exchange efficiency, resistance loss and air leakage rate of the low-temperature economizer under different operating conditions are verified, and the key performance indicators at different collection frequencies are intuitively displayed through curve graphs, thereby improving the convenience and adequacy of performance verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0030] Figure 1 A schematic flow chart of a performance verification test method for a low-temperature economizer provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0031] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0032] like Figure 1 As shown, a performance verification test method for a low-temperature economizer in the first embodiment of the present application, the specific implementation steps are as follows:

[0033] S1: Preset three test working conditions X1, X2, X3 and the positions of various required measurement parameters, where the parameters to be measured include inlet and outlet smoke temperature, inlet and outlet water temperature, smoke pressure and inlet and outlet smoke flow rate; the equipment required for the test working conditions includes a gas generator, a temperature regulator and a flow regulator to simulate different smoke conditions and create different test working conditions;

[0034] The temperature ranges in the test working conditions X1, X2 and X3 are 60℃-100℃, 100℃-140℃ and 140℃-180℃ respectively, so as to simulate the different temperature conditions that the low-temperature economizer may encounter in actual use and improve the reliability of performance verification.

[0035] S2: Select three low-temperature economizer samples and place them in the test conditions X1, X2, and X3 respectively, and install the sensor module at the preset designated position of the low-temperature economizer in S1;

[0036] S3: The sensor module in S2 is used to collect data of each measurement parameter position under each test condition. The data collection frequency is once every 5-20 seconds. The sensor module includes a thermometer, a pressure sensor and a flow meter.

[0037] Thermometers are installed at the inlet and outlet water sides of the low-temperature economizer and at the flue gas inlet and outlet to monitor the changes in the inlet and outlet water temperature and the flue gas inlet and outlet air temperature in real time.

[0038] Pressure sensors are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to facilitate real-time monitoring of changes in the flue gas inlet and outlet pressures.

[0039] Flow meters are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to monitor the changes of the flue gas flow at the smoke inlet and the smoke outlet in real time, so as to calculate the air leakage rate of the low-temperature economizer.

[0040] S4: Analyze and calculate the data obtained in S3 respectively, and calculate the heat exchange efficiency P, resistance loss Y and air leakage rate W corresponding to the data collection frequency under the test conditions X1, X2 and X3;

[0041] The calculation formula of heat transfer efficiency P is:

[0042]

[0043] Among them, T2 is the water outlet temperature, T1 is the water inlet temperature, E1 is the flue gas inlet temperature, and E2 is the flue gas outlet temperature;

[0044] The calculation formula of resistance loss Y is:

[0045] Y=A1-A2

[0046] Among them, A1 is the flue gas inlet pressure, A2 is the flue gas outlet pressure;

[0047] The calculation formula of air leakage rate W is:

[0048]

[0049] Among them, F1 is the flue gas inlet flow rate, F2 is the flue gas outlet flow rate,

[0050] S5: According to the calculation results in S4, the heat exchange efficiency P-collection frequency t is produced respectively. i , resistance loss Y-collection frequency t i And air leakage rate W-collection frequency t i The curve diagram, where i = 1, 2, 3...n, is used to determine the acquisition frequency t in different working conditions. i The curve chart can clearly show the performance trend of the low-temperature economizer under different working conditions, temperatures, pressures and flow rates. At the same time, the curve chart can intuitively compare the changes in the low-temperature economizer under different working conditions, which is helpful to judge the impact of different working conditions on the performance of the low-temperature economizer.

[0051] This method verifies the key performance indicators of heat exchange efficiency, resistance loss and air leakage rate of the low-temperature economizer under different operating conditions by real-time monitoring, analysis and calculation of the operating parameter data of the low-temperature economizer under various operating conditions, and intuitively displays the key performance indicators under different acquisition frequencies through curve graphs, thereby improving the convenience and adequacy of performance verification.

[0052] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A performance verification test method for a low-temperature economizer, characterized in that: The specific implementation steps are as follows: S1: Preset three test working conditions X1, X2, X3 and the positions of various required measurement parameters, where the parameters to be measured include inlet and outlet smoke temperature, inlet and outlet water temperature, smoke pressure and inlet and outlet smoke flow rate; S2: Select three low-temperature economizer samples and place them in the test conditions X1, X2, and X3 respectively, and install the sensor module at the preset designated position of the low-temperature economizer in S1; S3: The sensor module in S2 is used to collect data of each measurement parameter position under each test condition, and the data collection frequency is once every 5-20 seconds; S4: Analyze and calculate the data obtained in S3 respectively, and calculate the heat exchange efficiency P, resistance loss Y and air leakage rate W corresponding to the data collection frequency under the test conditions X1, X2 and X3; S5: According to the calculation results in S4, the heat exchange efficiency P-collection frequency t is produced respectively. i , resistance loss Y-collection frequency t i And air leakage rate W-collection frequency t i Graph of the curve.

2. A performance verification test method for a low-temperature economizer according to claim 1, characterized in that: The sensor module includes a thermometer, a pressure sensor and a flow meter.

3. A performance verification test method for a low-temperature economizer according to claim 2, characterized in that: The thermometers are respectively arranged at the inlet and outlet water sides of the low-temperature economizer and at the flue gas inlet and outlet to monitor the changes of the inlet and outlet water temperature and the inlet and outlet air temperature of the flue gas in real time; The pressure sensors are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to monitor the changes of the flue gas inlet and outlet pressures in real time; The flow meters are respectively arranged at the flue gas inlet and outlet of the low-temperature economizer to monitor the changes of the flue gas flow at the smoke inlet and the smoke gas flow at the smoke outlet in real time.

4. A performance verification test method for a low-temperature economizer according to claim 1, characterized in that: The calculation formula of the heat exchange efficiency P is: Among them, T2 is the water outlet temperature, T1 is the water inlet temperature, E1 is the flue gas inlet temperature, and E2 is the flue gas outlet temperature.

5. The performance verification test method of a low-temperature economizer according to claim 1, characterized in that: The calculation formula of the resistance loss Y is: Y=A1-A2 Among them, A1 is the flue gas inlet pressure and A2 is the flue gas outlet pressure.

6. A performance verification test method for a low-temperature economizer according to claim 1, characterized in that: The calculation formula of the air leakage rate W is: Among them, F1 is the flue gas inlet flow rate, and F2 is the flue gas outlet flow rate.

7. A performance verification test method for a low-temperature economizer according to claim 1, characterized in that: The temperature ranges in the test working conditions X1, X2 and X3 are 60°C-100°C, 100°C-140°C and 140°C-180°C respectively.

8. A performance verification test method for a low-temperature economizer according to claim 1, characterized in that: The curve graph can clearly show the performance trend of the low-temperature economizer under different operating conditions, temperatures, pressures and flow rates.

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